Blockchain is a shared, immutable ledger that facilitates the process of recording transactions and tracking assets in a business network. Just like internet, blockchain technology developed over the years with many contributions of many brilliant individuals. 

Most people think bitcoin and blockchain synonyms which is wrong. However, it is understandable because bitcoin is the first working blockchain. First running blockchain was started 20 years ago. It is safe to say Scott Stornetta and Stuart Haber were among first ones to notice a problem in 1991. They were working on a solution to make dijital data immutable. Their published paper on "timestamp" will be extremely important years later for the foundation of bitcoin. 

Today blockchain technology is being used by many firms for their data integrity, transparency and decentralisation. Bitcoin and altcoins are working on different consensus systems but they all work with blockchain principle. To understand any Web 3 feature, we need know the fundamentals of blockchain. 

*This topic must presented in 2 hours in 2 weeks schedule. 

**Prior to the this topic "History of Internet" and "Concept of Money and Digital Payment Systems" are requried.